354 ADDITIONS. 



of sponge, rather exceeding an inch and a quarter in 

 diameter. The external surfaces of both sides were 

 the same. The type-specimen from Scarborough 

 thinly coats a mass of sandstone, and it is interesting 

 and instructive to find a specimen of the same species 

 under such differences of form and location. 



HALICHONDEIA PATTEKSONI, Plate XLYI. 

 RAPHIODESMA SOKDIDA, Plate LXXVI. 



Among some specimens I received from one of the 

 Hastings trawlers from the Diamond ground, on a 

 branch of Sertularia filicula there were two specimens 

 of sponges, one above the other. The upper one was 

 an irregular but compact dark-brown mass, three 

 fourths of an inch in its greatest diameter, of Halichon- 

 dria Pattersoni; the lower one, immediately beneath 

 H. Pattersoni, was an irregular shrivelled elongate 

 specimen of Raphiodesma sordida, exceeding an inch in 

 length and about a quarter of an inch in breadth, of a 

 dull, ochreous, yellow colour, in the dried state. Both 

 sponges are in an excellent state of preservation, and 

 in every respect they agree in their anatomical struc- 

 tures with the types of their species. 



RAPHIODESMA LINGUA, Plate LXXVII. 



The Rev. A. M. Norman has informed me that he 

 has a specimen of this species from Shetland that is 

 eleven inches in height, six and three quarters in breadth 

 near the base, four inches near the middle, and one and 

 a quarter inch in thickness. Its form is irregularly 

 tongue-shaped. It would thus appear that this species 

 frequently attains to a considerable size. 



